Low operation voltage macromolecular composite memory assisted by graphene nanoflakes

Ying Chih Lai, Di Yan Wang, I. Sheng Huang, Yu Ting Chen, Yung Hsuan Hsu, Tai Yuan Lin, Hsin Fei Meng, Ting Chang Chang, Ying Jay Yang, Chia Chun Chen, Fang Chi Hsu, Yang Fang Chen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

46 Citations (Scopus)


The trend towards simple and low-cost processing is one of the most important for macromolecular memory development. Here, bistable memory devices using a solution-processable active material, a mixture of graphene nanoflakes (GNFs) and insulating poly(vinyl alcohol) (PVA), are investigated, which serve as the first example for the direct integration of as-prepared nanoscale graphene into macromolecular memory devices through a one-step low-temperature processing method. Bistable electrical switching behavior and nonvolatile rewritable memory effects are realized by using an indium-tin-oxide/GNF-PVA/ silver (ITO/GNF-PVA/Ag) sandwich structure. The resulting device exhibits low operation voltages of +1.4 V (turn-on) and -1.3 V (turn-off), which is promising for memory cells with low power consumptions. The programmable ON- and OFF-states possess a retention time of over 104 s and endure up to 107 read pulses. The carrier transport in the OFF- and ON-states follows the typical trap-limited space charge limited current and Ohmic laws, respectively. The asymmetric electrical switch behavior is therefore attributed to conducting filaments formed in the PVA layer assisted by the charged GNFs that induce the transition of the conductivity. Our study provides a potential approach for integrating as-prepared graphene into macromolecular memory devices with excellent performances through a simple solution-process.

Original languageEnglish
Pages (from-to)552-559
Number of pages8
JournalJournal of Materials Chemistry C
Issue number3
Publication statusPublished - 2013 Jan 21

ASJC Scopus subject areas

  • General Chemistry
  • Materials Chemistry


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